Two naive siblings, under the same roof, find themselves drawn to each other's secret desires. One evening, as they sneak into the attic for a late-night chat, their innocent conversation turns heated. The 18-year-old sister's curiosity piqued, she tentatively reaches out to touch her brother's hardening cock through his pajama pants. He gasps, but doesn't pull away. Their hearts pound as they explore each other's virgin bodies, their first time a tender, fumbling dance of discovery.